diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2011-08-31 15:45:10 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2011-10-06 09:48:04 +0200 |
| commit | 697ab892786d47008807a49f57b2fd86adfcd098 (patch) | |
| tree | d64a416a4961237e980e9c5e3ab176adb95b44d8 /target-ppc/translate_init.c | |
| parent | 2bd9543cd303d9f6cbd37b7466bb03543035156b (diff) | |
Implement POWER7's CFAR in TCG
This patch implements support for the CFAR SPR on POWER7 (Come From
Address Register), which snapshots the PC value at the time of a branch or
an rfid. The latest powerpc-next kernel also catches it and can show it in
xmon or in the signal frames.
This works well enough to let recent kernels boot (which otherwise oops
on the CFAR access). It hasn't been tested enough to be confident that the
CFAR values are actually accurate, but one thing at a time.
Signed-off-by: Ben Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/translate_init.c')
| -rw-r--r-- | target-ppc/translate_init.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c index 9ea193dcf6..211f3bd0c1 100644 --- a/target-ppc/translate_init.c +++ b/target-ppc/translate_init.c @@ -129,6 +129,19 @@ static void spr_write_lr (void *opaque, int sprn, int gprn) tcg_gen_mov_tl(cpu_lr, cpu_gpr[gprn]); } +/* CFAR */ +#if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) +static void spr_read_cfar (void *opaque, int gprn, int sprn) +{ + tcg_gen_mov_tl(cpu_gpr[gprn], cpu_cfar); +} + +static void spr_write_cfar (void *opaque, int sprn, int gprn) +{ + tcg_gen_mov_tl(cpu_cfar, cpu_gpr[gprn]); +} +#endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */ + /* CTR */ static void spr_read_ctr (void *opaque, int gprn, int sprn) { @@ -6489,7 +6502,7 @@ static void init_proc_970MP (CPUPPCState *env) #define POWERPC_BFDM_POWER7 (bfd_mach_ppc64) #define POWERPC_FLAG_POWER7 (POWERPC_FLAG_VRE | POWERPC_FLAG_SE | \ POWERPC_FLAG_BE | POWERPC_FLAG_PMM | \ - POWERPC_FLAG_BUS_CLK) + POWERPC_FLAG_BUS_CLK | POWERPC_FLAG_CFAR) #define check_pow_POWER7 check_pow_nocheck static void init_proc_POWER7 (CPUPPCState *env) @@ -6508,6 +6521,14 @@ static void init_proc_POWER7 (CPUPPCState *env) &spr_read_purr, SPR_NOACCESS, &spr_read_purr, SPR_NOACCESS, 0x00000000); + spr_register(env, SPR_CFAR, "SPR_CFAR", + SPR_NOACCESS, SPR_NOACCESS, + &spr_read_cfar, &spr_write_cfar, + 0x00000000); + spr_register(env, SPR_DSCR, "SPR_DSCR", + SPR_NOACCESS, SPR_NOACCESS, + &spr_read_generic, &spr_write_generic, + 0x00000000); #endif /* !CONFIG_USER_ONLY */ /* Memory management */ /* XXX : not implemented */ |